Hyper ST Converted Care Of RCM

Awesome looking truck Arct1k!

It's actually motivated me to start/finish up my Hyper ST conversion that has been sitting on the shelf for months now!

A question for you though (as it's currently my stalling point): How is your battery tray secured to the chassis?

I have the same RCMonster tray, and for the life of me, I just can't seem to figure out a good mounting method.

Any info/pics would be very much appreciated.